Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build-dev.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup qemu
         uses: docker/setup-qemu-action@v3

.github/workflows/build-master.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup qemu
         uses: docker/setup-qemu-action@v3

.github/workflows/build-pr.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup qemu
         uses: docker/setup-qemu-action@v3